[Rockhounds] Massive meteor crater discovered beneath Greenland's ice is much older than thought

[Dora Smith]

What Jim said makes sense.  In fact it occurred to me.  But they 
specifically talked about the asteroids themselves.

Dora


On 3/11/22 5:33 AM, axel.emmermann at telenet.be wrote:
> Meteor crater near Winslow, Arizona, is living proof for that.
> Impactor is believed to be somewhere between 30 and 50 meters in diameter. The crater is about 1200 meters wide.
>
> CHeers
> Axel
>
> ----- Oorspronkelijk bericht -----
> Van: "Murowchick, James" <murowchickj at umkc.edu>
> Aan: "Rockhounds at drizzle.com" <rockhounds at rockhounds.drizzle.com>
> Verzonden: Vrijdag 11 maart 2022 04:05:35
> Onderwerp: Re: [Rockhounds] Massive meteor crater discovered beneath Greenland's ice is much older than thought
>
> I think they said the crater was 31 km wide and the Chixilub crater was 200 km I diameter.  The crater produced by an impact is far, far wider than the meteorite causing it.
> Jim
> James Murowchick, Ph.D.
> Professor Emeritus
> Department of Earth & Environmental Sciences
> University of Missouri-Kansas City
> 420 Flarsheim Hall
> 5110 Rockhill Rd
> Kansas City, MO 64110
> murowchickj at umkc.edu
>
>
> From: Rockhounds <rockhounds-bounces at rockhounds.drizzle.com> on behalf of Dora Smith <tiggernut24 at yahoo.com>
> Date: Thursday, March 10, 2022 at 8:55 AM
> To: rockhounds at rockhounds.drizzle.com <rockhounds at rockhounds.drizzle.com>
> Subject: Re: [Rockhounds] Massive meteor crater discovered beneath Greenland's ice is much older than thought
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>
> What was going on in the solar system at that time?
>
> I wonder how this affected recovery from the Chicxulub asteroid and from
> the Deccan traps, if they were even over yet?   The asteroid fell right
> in the middle of the Deccan Traps and changed the nature of that eruption.
>
> One other thing.   The CNN article says the Greenland asteroid was 19
> miles or 31 km wide, and the Chixulub or whatever asteroid was 200 km
> wide.  I thought the Chixulub (I give up) asteroid was 6 miles across?
> Something seems mangled here.  If a hundred mile wide asteroid ever
> smashed into Earth, I suspect it would melt the planet and break off
> another moon.
>
> Yours,
>
> Dora Smith
>
>
>
> On 3/9/22 4:21 PM, Kreigh Tomaszewski wrote:
>> The age of a 31-kilometer (19-mile) wide meteorite crater discovered under
>> a kilometer of Greenland ice had long puzzled scientists.
>>
>> The Hiawatha crater was exceptionally well preserved despite glacier ice
>> being incredibly effective at erosion. Its state fueled talk that the
>> meteorite might have hit as recently as 13,000 years ago.
>> However, the crater, which is one of the world's largest, has now been
>> definitively dated -- and it is much, much older. In fact, it slammed into
>> the Earth just a few million years after dinosaurs went extinct, about 58
>> million years ago.
>>
>> "Dating the crater has been a particularly tough nut to crack, so it's very
>> satisfying that two laboratories in Denmark and Sweden, using different
>> dating methods arrived at the same conclusion. As such, I'm convinced that
>> we've determined the crater's actual age, which is much older than many
>> people once thought," said Michael Storey, head of geology at the Natural
>> History Museum of Denmark, in a news release.
>> When the asteroid hit, the Arctic was covered in balmy rainforest with
>> temperatures of around 68 degrees Fahrenheit (20 degrees Celsius). Local
>> inhabitants would have included crocodiles, turtles and primitive
>> hippo-like animals, said Storey, who was an author of a new paper on the
>> crater published in the journal Science Advances.
>> The Hiawatha impact crater could swallow up Washington DC and is larger
>> than about 90% of the roughly 200 previously known impact craters on Earth.
>>
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